A cleaned up "classic" Hudson boiler with more added on details, prototypical drivers, improved valvegear. It was a good looking engine then and will be even better with more details and a paint job using current technology. I would vote for a new, longer centipede tender to be different as there are still many, many AF Hudsons around and available. I would also vote for a railsounds, smoke and Legacy version. There is no comparison between Legacy and conventional operation.
Rich